Alamosa, Colorado Air Quality
Alamosa County, Colorado (CO)
↓ Improvingover 10 years
10-Year AQI Trend
The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days). This area has seen measurable air quality improvement over the decade.
Air Quality Day Breakdown
Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).
Year-by-Year Data
| Year | Median AQI | 90th Pct | Max AQI | Good Days | Moderate | Unhealthy+ | Pollutant |
|---|---|---|---|---|---|---|---|
| 2023 | 22 | 53 | 70 | 142 | 23 | 0 | PM2.5 |
| 2022 | 11 | 44 | 134 | 107 | 8 | 1 | PM2.5 |
| 2021 | 12 | 35 | 109 | 114 | 5 | 1 | PM2.5 |
| 2020 | 14 | 40 | 65 | 112 | 7 | 0 | PM2.5 |
| 2019 | 12 | 23 | 28 | 107 | 0 | 0 | PM2.5 |
| 2018 | 19 | 37 | 235 | 348 | 11 | 1 | PM10 |
| 2017 | 19 | 32 | 53 | 351 | 3 | 0 | PM10 |
| 2016 | 18 | 31 | 271 | 354 | 4 | 2 | PM10 |
| 2015 | 18 | 32 | 87 | 356 | 8 | 0 | PM10 |
| 2014 | 19 | 37 | 124 | 345 | 18 | 2 | PM10 |
What This Means for Alamosa County Residents
Alamosa, Colorado has received an Air Quality Grade of A (82/100) based on a decade of EPA monitoring data. The current median AQI of 22 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 3 points over the monitoring period. This trend suggests continued investment in emission controls and cleaner energy.
The primary pollutant affecting this area is Coarse Particulate Matter (PM10). Over the past 5 years, this area has averaged 0 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.